Fix admin welcome illustration not found

Merged Paul Slaughter requested to merge 34768-fix-welcome-images-for-admin into master

What does this MR do?

This MR fixes an illustration not loading in the admin welcome page. Note this only happens in a production environment and can be recreated in development by following the steps in #34768 (comment 240588325).

Screenshots

20191105_bug_fix_welcome_images

Does this MR meet the acceptance criteria?

Conformity

Related to #34768 (closed)

Edited by Paul Slaughter